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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7902ea53242f0412b4a31953e8c2ec77ed431b01ae6959803f7d96a78c66320' 
  AND token = 'XPj2+CEwxX0m2dcCQYi0fnEMMbZGg9AYmvbE9gIklMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}